slgmr.vbs -rearm ( command prompt admin rights ) reboot activate with kms_vl_all for rds cal license renew RDS grace period, you need to find the following registry key and delete it. “HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ Terminal Server\RCM\GracePeriod" Before you can delete the registry key, you need to change ownership. You can do that by following these steps: Right-Click on the key. Click on “Permissions”. Click on “Advanced”. Click on “Owner”. Select “Administrators”. Click on “Apply” You can now delete the key , Delete value inside * GracePeriod * Reboot the server and you now have a new grace period.